【作者】 曾菊玲；

【导师】 金力军；

【作者基本信息】 西安电子科技大学 ， 通信与信息系统， 2003， 硕士

【摘要】 跳频通信是现代通信系统抗干扰和提高系统容量的重要技术之一，跳频系统的性能依赖于所选调指制度的频谱结构、效率，依赖于调制制度对频差的敏感性、抗限幅失真、抗干扰的能力。本文首先较详细地讨论了跳频抗干扰的能力与调制制度的关系，接着分别研究了几种常用调制方式(MFSK，MPSK，OFDM)上述几方面的性质，针对各跳频系统存在的问题提出了相应解决方案，在本论文后半部分重点讨论了OFDM跳频系统的实现方案、性能及改进措施。文中做了大量仿真，以验证各调制制度各方面的性能及各改进措施的可行性，最终得出结论，OFDM是跳频通信中可以选用的一种调制方式。更多还原

【Abstract】 The frequency-hopping communication is one of the most important technique to overcome interference and to increase system’s capacity in the mordcn communication syslem.The performance of the frequency-hopping system rely on configuration and efficiency of the frequency spectrum of the selected modulation mode. The frequency difference sensitivity of the modulation mode and the ability to overcome distortion by limiting amplitude of the signal and to overcome interference also affect the performance, too.In this paper, the relationship between the ability to overcome interference and the modulation mode is discussed at first. Then the characters in some aspects specif’ed above of some common modulation mode such as MFSK MPSK OFDM are studied.On this base,some according solutions to the problem of the different frequency-hopping system are put forward.In the past half of this paper, the realization scheme , pcrforemance and improving measures of OFDM are studied. There are lot of simulations in this paper which validate the feasibility of the improving measures and the characters of the modulation mode.Comparing these modulation mode,wc think that MASK-OFDM frcqyency-hopping is the mode of frequency-hopping communication in future.更多还原